To provide a bearing member wherein a grooved part for generation of a dynamic pressure is formed while the bearing surface provided on the inside of an electrocast portion is retained in high precision, and its manufacturing method.
In the separating process of the electrocast portion 4 from a master 10, the master 10 is drawn off in such a direction that the shaping part 12 passes the separation surface 15 of the portion 4 from the master 10, whereby a projection 12a on the shaping part 12 deforms part of the separation surface 15 of the electrocast portion 4 plastically. Thereby a plurality of axially directed grooves 8a are formed at the inside of the electrocast portion 4 by plastic deformation generated by the projection 12a, and the part of the separation surface 15 not subjected to plastic deformation due to the projection part 12a remains as the bearing surface 7.
KOMORI ISAO
JP2007071375A | 2007-03-22 | |||
JP2003056552A | 2003-02-26 | |||
JPH10137886A | 1998-05-26 | |||
JPH08243673A | 1996-09-24 | |||
JP2007071375A | 2007-03-22 |
Yoshiyuki Shiraishi
Kunihiko Shiromura
Tsuyoshi Kumano